Product Description The SilencerCo AC863 is a precision-engineered threaded barrel designed for Glock 21 Gen3 pistols chambered in .45 ACP. Built to the same exacting standards as SilencerCo&';s acclaimed suppressor lineup, this barrel is crafted from 416R stainless steel and finished in a tough black nitride coating that resists corrosion, abrasion, and harsh environmental conditions. Measuring 5.30 inches in length, it features a 0.578-28 threaded muzzle end for direct suppressor attachment, and ships complete with a thread protector to safeguard the threads when shooting suppressor-free. Whether you are integrating a silencer into your setup or simply upgrading your factory barrel for improved performance, the AC863 delivers the reliability and quality SilencerCo is known for. Product Highlights 416R Stainless Steel Construction: Machined from high-grade 416R stainless steel for exceptional durability, strength, and long-term reliability under demanding use. Black Nitride Finish: The black nitride surface treatment provides outstanding corrosion and wear resistance while giving the barrel a sleek, tactical appearance. Suppressor-Ready Threading: Features 0.578-28 threads at the muzzle, allowing seamless attachment of compatible .45 ACP pistol suppressors and pistons. Includes Thread Protector: Ships with a thread protector to keep the muzzle threads clean and undamaged when not using a suppressor. Direct Fit for Glock 21 Gen3: Engineered as a drop-in replacement for the Glock 21 Gen3, delivering a secure, accurate fit with no gunsmithing required. Specs Brand: SilencerCo Model: AC863 Caliber: .45 ACP Barrel Length: 5.30" Material: 416R Stainless Steel Finish: Black Nitride Thread Size: 0.578-28 Twist Rate: 1:10" RH Compatible Firearm: Glock 21 Gen3 Includes: Thread Protector Weight: 0.32 lbs UPC: 817272012019 MPN: AC863 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>